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We found 9 dictionaries with English definitions that include the word zeptosecond: Click on the first link on a line below to go directly to a page where "zeptosecond" is defined. General (8 matching dictionaries) zeptosecond: American Heritage Dictionary of the English Language [home, info] zeptosecond: Collins English Dictionary [home, info] zeptosecond: Merriam-Webster's Online Dictionary, 11th Edition [home, info] zeptosecond: Wiktionary [home, info] zeptosecond: Dictionary.com [home, info] Zeptosecond: Wikipedia, the Free Encyclopedia [home, info] zeptosecond: Dictionary/thesaurus [home, info] zeptosecond: Worthless Word For The Day [home, info] Tech (1 matching dictionary) zeptosecond: Rane Professional Audio Reference [home, info]